Renewable sources of energy are those that are replenished naturally on a human timescale.
- Solar energy is derived from the sun and is a renewable, clean energy source. It is continuously available as long as the sun shines.
- Wood is a renewable resource, but it takes time to regenerate, and burning wood can release carbon emissions. It is not as clean or efficient as solar energy.
- Coal and Petroleum are non-renewable fossil fuels, as they are finite and take millions of years to form. They contribute to environmental pollution and climate change.
Thus, the correct answer is Solar energy.